Communication terminal with a parameterised bandwidth expansion, and method for the bandwidth expansion thereof
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Accused Products
Abstract
The disclosure relates to a communication terminal having a bandwidth expansion device for expanding the bandwidth of a narrowband voice signal, on a low-frequency and/or high-frequency side, by synthesizing at least one frequency band on the basis of the narrowband voice signal. A qualitatively satisfactory bandwidth expansion is thus performed using a plurality of net bit rates. The bandwidth expansion device is further connected to a memory containing a lookup table comprising at least one parameter value for the bandwidth expansion, for at least two net bit rates of the narrowband voice signal. A method for expanding a bandwidth of a narrowband voice signal having at least two net bit rates in a communication terminal is also disclosed herein.
18 Citations
12 Claims
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1-6. -6. (canceled)
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7. A communication device, comprising:
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a bandwidth expansion device for expanding a bandwidth of a narrowband speech signal at its low-frequency and/or high-frequency end by synthesis of at least one frequency band contained within said narrowband speech signal; and
a memory unit, communicatively coupled to said bandwidth expansion device, wherein said memory device stores a reference table that contains at least one parameter value for the bandwidth expansion for at least two net bit rates of the narrowband speech signal. - View Dependent Claims (8)
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9. A method for expanding a bandwidth of a narrowband speech signal for a communication terminal, comprising the steps of:
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a) detecting a net bit rate of the narrowband speech signal of the communication terminal;
b) accessing a memory that contains a reference table which includes associations between at least two net bit rates and parameter values for bandwidth expansion, in order to determine the at least one parameter value which is suitable for the detected net bit rate;
c) expanding the bandwidth by means of a bandwidth expansion device on the basis of the parameters determined for a current bit rate in step b). - View Dependent Claims (10, 11, 12)
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Specification